docs(python): fix duplicated headings on layers and types API pages #10092

Job	Run time
plan	11s
core / ${{ matrix.os }}	0s
integration_object_store / ${{ matrix.os }}	0s
binding_ruby / ${{ matrix.os }}	0s
binding_c / ${{ matrix.os }}	0s
binding_python / ${{ matrix.os }}	0s
binding_cpp / ${{ matrix.os }}	0s
binding_java / ${{ matrix.os }}	0s
binding_go / ${{ matrix.os }}	0s
binding_nodejs / ${{ matrix.os }}	0s
binding_dotnet / ${{ matrix.os }}	0s
	11s

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